body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #00f7ffaf; /* 设置一个备用背景颜色 */
    font-family: 华文中宋, serif;
  }

  ul, li {
    padding: 0;
    margin: 0;
    list-style: none;
}

a {
    text-decoration: none;
    outline: none; 
    color: #b1dfe7; 
    font-weight: 600;
}

  .video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
  }

  .video-background video {
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }

  .video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5); /* 半透明的黑色遮罩 */
    z-index: 0;
  }

  .content {
    z-index: 1;
    color: #fff;
    text-align: center;
    font-size: 40px;
  }

  .content a {
    margin: 30px auto;
    padding: 10px 100px;
    background-color: #329bd7ab;
    border-radius: 50px;
    display: block;
  }

  .content h1 {
    color: #b1dfe7;
  }